Hi Perry,
By Pigeon Gun, I guess I mean that they are both heavier than your average game gun, in my case 7 1/2lbs (Belgian) & 7lb 12oz(Greener)..also the stock dimensions for drop @ heel & comb are on the "thin side" such that the gun will pattern on the high side...you see a good bit more of the rib when mounted.Ribs are wide & flat, with long (30") bbls.A wee bit muzzle heavy too.Usually pretty well built, as some reputations were on the line when shooting live pigeon shoots
Perhaps Pigeon gun means different things to different folk, but those are what I kinda of think of when a P gun is mentioned.
Also my Greener has a "blue rock" pigeon engraved on the rib at the breech.
They seem to make good sporting clay guns,thats what i use em for.. pass shooting duck too, perhaps
cheers
franc